package com.moshme.web.controller.common;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.hutool.crypto.SecureUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.moshme.common.exception.ServiceException;
import com.moshme.common.utils.SecurityUtils;
import com.moshme.project.service.FileService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.moshme.common.config.MoshmeConfig;
import com.moshme.common.constant.Constants;
import com.moshme.common.core.domain.AjaxResult;
import com.moshme.common.utils.StringUtils;
import com.moshme.common.utils.file.FileUploadUtils;
import com.moshme.common.utils.file.FileUtils;
import com.moshme.framework.config.ServerConfig;

/**
 * 通用请求处理
 *
 * @author moshme
 */
@RestController
@RequestMapping("/common")
public class CommonController {
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    @Autowired
    private FileService fileService;

    @Value("${moshme.profile}")
    private String storagePath;

    private static final String FILE_DELIMETER = ",";

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete   是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request) {
        try {
            if (!FileUtils.checkAllowDownload(fileName)) {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = MoshmeConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete) {
                FileUtils.deleteFile(filePath);
            }
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file, String path) throws Exception {
        if (file.isEmpty() || file.equals("") || file.getSize() <= 0) {
            throw new ServiceException("上传的文件为空");
        }
        if (20 * 1024 * 1024 < file.getSize()) {
            throw new ServiceException("上传的文件过大");
        }
        // 文件原名
        String originalfileName = file.getOriginalFilename();
        if (org.apache.commons.lang3.StringUtils.isBlank(originalfileName)) {
            throw new ServiceException("文件名异常");
        }
        // 后缀名
        String suffixName = originalfileName.substring(originalfileName.lastIndexOf(".")).toLowerCase();
        String md5 = "";
        InputStream inputStream = null;
        try {
            inputStream = file.getInputStream();
            md5 = SecureUtil.md5(inputStream);
        } catch (IOException e) {
            throw new ServiceException("获取文件MD5出错");
        }finally {
            if (inputStream!=null){
                inputStream.close();
            }
        }
        // MD5、大小、后缀相同的文件视为同一个文件
        LambdaQueryWrapper<com.moshme.project.domain.File> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(com.moshme.project.domain.File::getMd5, md5).eq(com.moshme.project.domain.File::getType, suffixName).eq(com.moshme.project.domain.File::getSize, file.getSize());
        com.moshme.project.domain.File data = fileService.getOne(lambdaQueryWrapper);
        if (data != null) {
            return AjaxResult.success(data.getNetworkPath());
        }
        String newFileName = UUID.randomUUID() + suffixName;
        String NetworkPath = "";
        try {
            // 上传文件路径
            String filePath = MoshmeConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileNamePrefix = filePath + "/" + path;
            NetworkPath = FileUploadUtils.upload(fileNamePrefix, file);
        } catch (IOException e) {
            throw new ServiceException("文件上传失败");
        }
        com.moshme.project.domain.File saveFile = new com.moshme.project.domain.File();
        saveFile.setName(originalfileName);
        saveFile.setOriginalName(originalfileName);
        saveFile.setType(suffixName);
        saveFile.setLocalPath(storagePath +"/" + path + originalfileName);
        saveFile.setNetworkPath(NetworkPath);
        saveFile.setSize(file.getSize());
        saveFile.setMd5(md5);
        fileService.save(saveFile);
        return AjaxResult.success(NetworkPath);
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception {
        try {
            // 上传文件路径
            String filePath = MoshmeConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files) {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        try {
            if (!FileUtils.checkAllowDownload(resource)) {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = MoshmeConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

}
